CN207868229U - The electrochemical appliance of adjustable color temperature - Google Patents
The electrochemical appliance of adjustable color temperature Download PDFInfo
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- CN207868229U CN207868229U CN201820066857.7U CN201820066857U CN207868229U CN 207868229 U CN207868229 U CN 207868229U CN 201820066857 U CN201820066857 U CN 201820066857U CN 207868229 U CN207868229 U CN 207868229U
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Abstract
A kind of electrochemical appliance of adjustable color temperature, including light-emitting electrochemical element and electric driven color-changing part.The light-emitting electrochemical element includes substrate, anode layer, luminescent layer and cathode layer.The work function of the cathode layer is greater than or equal to 4eV.The electric driven color-changing part is located at the substrate side, and includes two intervals opposite conductive layer, electrode layer and electrochromic layers.The light that the electric driven color-changing part is used to send out for the light-emitting electrochemical element passes through, and can adjust the colour temperature for changing light, achievees the purpose that adjustable change light color temperature.The metal material that the cathode layer is relatively low using activity, work function is big can solve the problems, such as to be easy oxidation using high activity metal in the past and processing procedure is complicated.
Description
Technical field
The utility model is related to a kind of electrochemical appliances, and being combined with electric driven color-changing part more particularly to one kind being used as filter
Mating plate, to adjust the light-emitting electrochemical device of light color temperature.
Background technology
In recent years, solid-state white organic light emission electrochemical element (light-emitting electrochemical
Cell, abbreviation LEC) cause to pay high attention to, because it shows several than white organic LED (organic light-
Emitting diode, abbreviation OLED) more preferable advantage.Compared with the complex multilayer of white light OLED, white light LEC only needs
The luminous layer structure of single layer and simple solution process.Since the luminescent layer of LEC only needs single layer, electrochemical forms are advantageously formed
P-type doped region (oxidation), and be formed about N-shaped doped region (reduction) in cathode interface, the generation type of the doped region,
It is to be driven down via bias, makes zwitterion separation and moved toward cathode at anode electrode, and forming oxygen at electrode
The p-type and N-shaped doped region changed and restored.Ohmic contact can be formed between these electrochemical doping areas and electrode and carrier is promoted to note
Enter, allows LEC that can have lower operation voltage and higher power efficiency.
On the other hand, research in recent years finds opposite colour temperature (the correlated color of background illumination
Temperature, abbreviation CCT) Human Physiology and health can be influenced.People is suitble to the photograph using high color temperature when diurnal
Bright system, on the contrary, being relatively suitble to the lighting system using low color temperature in evening events.Due to the bias light of different opposite colour temperatures
Source is necessary for various illuminations application, so when LEC is applied to the intelligent illuminating system of modernization, LEC must be available for i.e.
Time modulation is with respect to colour temperature, this is important demand, therefore this case proposes innovation improvement for this important topic.
Utility model content
The purpose of this utility model is to provide a kind of electrochemical appliances of adjustable color temperature.
The electrochemical appliance of the utility model adjustable color temperature, including light-emitting electrochemical element, can be powered and send out initial
Light, the light-emitting electrochemical element include with substrate of the first opposite face with the second face, first face positioned at the substrate
Anode layer, the luminescent layer on the anode layer, and on the luminescent layer and with cathode layer made of metal, the cathode
The work function of layer is greater than or equal to 4eV.The electrochemical appliance of the adjustable color temperature also includes electric driven color-changing part, is located at the substrate
Second face, and include two opposite conductive layers in interval, positioned at the electrode layer of the conductive interlayer, and be located at institute
The electrochromic layer of one of conductive layer and the ion conductor interlayer is stated, which is used to supply the light-emitting electrochemical
The initial light for learning element passes through, and the color energy modulation of the electrochromic layer, is adjusted with changing the colour temperature of the initial light
Darkening.
The electrochemical appliance of adjustable color temperature described in the utility model, the cathode layer of the light-emitting electrochemical element be silver or
Gold.
The electrochemical appliance of adjustable color temperature described in the utility model, the light-emitting electrochemical element further include being located at the anode
The electric hole transport layer of layer and the interlayer that shines.
The electrochemical appliance of adjustable color temperature described in the utility model, the electric hole transport layer include poly- ethylenedioxythiophene with
Polystyrolsulfon acid.
The electrochemical appliance of adjustable color temperature described in the utility model, the anode layer are indium tin oxide.
The electrochemical appliance of adjustable color temperature described in the utility model, the luminescent layer include transition metal misfit object.
The electrochemical appliance of adjustable color temperature described in the utility model, the electric driven color-changing part further include two and are located at
The two opposite sides of the conductive layer, and the conductive layer, the electrode layer and the electrochromic layer are located in base therein
Material.
The electrochemical appliance of adjustable color temperature described in the utility model, each base material are glass.
The electrochemical appliance of adjustable color temperature described in the utility model also includes for applying electricity to the electric driven color-changing part
The control unit of pressure, the polarity of voltage or voltage value which applies the electric driven color-changing part can be changed, to change
The colour temperature of the initial light and obtain the modulation light.
The electrochemical appliance of adjustable color temperature described in the utility model also includes for logical to the light-emitting electrochemical element
Electricity, so that the light-emitting electrochemical element sends out the power supply unit of the initial light.
The beneficial effects of the utility model are：By the way that the electric driven color-changing part is incorporated into the light-emitting electrochemical element one
Side, due to the Color tunable control of the electric driven color-changing part, when the initial light of the light-emitting electrochemical element passes through the electroluminescent change
After color component, part coloured light will decay and be formed the modulation light of different-colour, achieve the purpose that adjustable color temperature.This shines
The cathode layer of electrochemical element can solve to use high activity metal in the past using active relatively low, the higher metal material of work function
And it is easy the problem aoxidized and processing procedure is complicated.
Description of the drawings
Other features and effect of the utility model will be clearly presented in the embodiment with reference to schema, wherein：
Fig. 1 is a schematic diagram of an embodiment of the electrochemical appliance of the utility model adjustable color temperature；
Fig. 2 is the one of the embodiment to penetrate spectrogram, illustrates to apply an electric driven color-changing part of the embodiment and fix
When the positive bias of 1.5V, spectrum is penetrated in different time；
Fig. 3 be one similar to Fig. 2 the spectrogram that penetrates, and be the negative bias for applying fixed 1.5V to the electric driven color-changing part
Pressure；
Fig. 4 is the one of the embodiment to penetrate spectrogram, illustrate to change the electric driven color-changing part is applied positive bias value (by
0V to 3V), penetrate spectrum in different positive biases.
Specific implementation mode
The utility model is described in detail with reference to the accompanying drawings and embodiments.
Refering to fig. 1, an embodiment of the electrochemical appliance of the utility model adjustable color temperature a, including light-emitting electrochemical
1, electric driven color-changing part of element (light-emitting electrochemical cell, abbreviation LEC)
(electrochromic device, abbreviation ECD) 2, power supply units 3 and a control unit 4.
The light-emitting electrochemical element 1 includes a substrate with opposite one first face 111 and second face 112
11,12, electric hole transport layers being located on the anode layer 12 of the anode layer in first face 111 for being located at the substrate 11
13, a luminescent layer 14 being located in the electric hole transport layer 13 and one are located on the luminescent layer 14 and are made with metal
Cathode layer 15.
Wherein, which is the substrate 11 of light-permeable, such as glass.The anode layer 12 is indium tin oxide (ITO), thick
Degree is about 120nm.The electric hole transport layer 13 includes poly- ethylenedioxythiophene (PEDOT) and polystyrolsulfon acid (PSS).The electric hole
The preparation method of transport layer 13 is the PEDOT of proper proportion and PSS to be mixed into aqueous solution, and be formed in the sun using rotary coating
It makes and obtains on pole layer 12.Due to the ITO match materials of PEDOT and the energy rank and the anode layer 12 of PSS mixing materials, help
It is injected by anode layer 12 in electric hole, so having the function of helping electric hole transmission.And use the electric hole transport layer of PEDOT and PSS
13 can improve the surface flatness of the anode layer 12, and film layer evenly, can reduce when helping to be subsequently formed the luminescent layer 14
Element generates the probability of leakage current.But it should be recognized that the utility model not is necessity so that the electric hole transport layer 13 is arranged, when
When omitting the electric hole transport layer 13, which is formed directly on the anode layer 12.
The luminescent layer 14 is organic material, therefore the light-emitting electrochemical element 1 of the present embodiment is organic light emission electrochemistry member
Part 1.The luminescent layer 14 may include at least one ionic transition metal misfit object (ionic transition metal
Complex, abbreviation iTMC), iTMC can effectively promote electroluminescence efficiency as 14 material of luminescent layer.The present embodiment with comprising
For two kinds of iTMC, material of main part is bluish-green luminescent material [Ir (dfppz)2(dtb-bpy)]+(PF6-), add a small amount of object material
Material is red light material [Ir (ppy)2(biq)]+(PF6-), the white light emitting element of host-guest system type is formed whereby.The dfppz is
1- (2,4-difluorophenyl) pyrazole, dtb-bpy are [4,4-di (tert-butyl) -2,2 '-bipyridine],
PF6For hexafluorophosphate, ppy 2-phenylpyridine, biq 2,2 '-biquinoline.In addition, should
Luminescent layer 14 can also blend ionic salt BMIM+(PF6 -), wherein BMIM is 1-butyl-3-methylimidazolium.It is logical
The a small amount of doping for crossing ionic salt can supply the additional ion of element and shorten the time that ion establishes p-n junction, and then contract
Short element lighting time, improving luminous efficiency.
It should be noted that due to iTMC materials have good thermal stability, carrier transfer ability, reaction rate and
The advantages that various luminous frequency spectrum, and the luminous mechanism of iTMC belongs to phosphorescent systems, this material luminous efficiency is higher than fluorescence high score
Sub- material, therefore the white light efficiency made, also superior to fluorescence polymer material, so when the utility model is implemented, this shines
Layer 14 is not necessary limitation to add ionic salt, because when being not added with ionic salt, has just had good shine
Efficiency.
The metal work function of the cathode layer 15 is greater than or equal to 4 electron-volts (eV), main to be had using active relatively low
The materials such as the metal material of higher work-functions, such as silver, gold, and the present embodiment uses silver.For organic light emission electrochemical element 1
For, when element applies forward bias voltage drop, electrons and holes are input to from cathode layer 15 and anode layer 12 in the luminescent layer 14 respectively,
14 material of luminescent layer dissociates anions and canons and is moved to different two end electrodes at this time, is present near anode layer 12
14 material of luminescent layer carries out oxidation reaction, forms p-type doped region, and 14 material of luminescent layer being present near cathode layer 15 is gone back
Original reaction, forms N-shaped doped region.It then continues to apply and stablizes identical forward bias voltage drop, electronics, electric hole will continue to be input to luminous
Layer 14, in N-shaped and the complete construction of p-type doped region, it may appear that i types area (intrinsic layer) and form p-i-n doping knots
Structure, and give out light i types area is compound, band can be made it possible at this time and is bent and then is greatly lowered energy barrier, promote electronics, electric hole is injected into
Efficiency in luminescent layer 14, make the luminescent layer 14 of electrode (cathode layer 15, anode layer 12) and organic material can rank match compared with
No problem, so the utility model can be used active relatively stable metal in air as the cathode layer 15, this is also this reality
The reason of 4eV being greater than or equal to novel 15 work function of cathode layer.
On the other hand, it is known that Organic Light Emitting Diode (OLED), cathode usually selects the metal of low work function, purpose
Energy barrier is injected to reduce, helps electronics to be easier to be injected into luminescent layer by cathode, such as using metals such as calcium, potassium, magnesium, but by
In the chemical stability of calcium, potassium, magnesium poor (activity is higher), low work function, it is easy oxidation under normal atmospheric environment and causes
Component wear needs to replace using the complicated alloy of processing procedure to avoid this problem.Relatively, with regard to light-emitting electrochemical element 1 and
Speech, injected with carrier due to the size of electrodes work functions influences smaller, the cathode layer 15 of the utility model to luminous efficiency
Low activity metal (work function is greater than or equal to 4eV) can be selected, such as the work function of silver is about 4.52~4.74eV, can be solved
The problem for being easy to aoxidize and processing procedure is complicated using high activity metal.
The electric driven color-changing part 2 is set to second face 112 of the substrate 11, and includes two opposite base materials in interval
21, electrode layer 23, Yi Jiyi of two conductive layers between the base material 21 22, one between the conductive layer 22
A electrochromic layer 24 positioned at one of described conductive layer 22 between the electrode layer 23.
Each base material 21 of the present embodiment is glass, and the base material 21 is located at the two opposite sides of the conductive layer 22, and will
The conductive layer 22, the electrode layer 23 and the electrochromic layer 24 are located in wherein.The conductive layer 22 is respectively formed in
On the opposite surface of the base material 21, and be conductive light-permeable film, such as indium tin oxide (ITO) or other
Transparent conductive oxide.The electric current that act as of the conductive layer 22 transmits and provides electronics and gives the electrochromic layer 24.It should be from
Sub- conductor layer 23 can use liquid or solid electrolyte material, and the electrochromic layer 24, the present embodiment are given for providing ion
Use the lithium perchlorate (LiClO of liquid4) electrolyte solution.The color energy modulation of the electrochromic layer 24, since it uses electricity
Off-color material is caused, will produce redox reaction under electric field action, material rank is enable to change, and then changes color.This is electroluminescent
24 material of photochromic layer such as WO3。
The power supply unit 3 is used to be powered to the light-emitting electrochemical element 1, so that the light-emitting electrochemical element 1 shines.Specifically
For, fixed bias can be applied to the light-emitting electrochemical element 1, so that it shines.
The control unit 4 is used to apply voltage to the electric driven color-changing part 2, and the polarity of voltage or voltage value that apply can quilts
Change, to change 24 color of electrochromic layer, make the electric driven color-changing part 2 become one immediately can modulation optical filter,
Extended meeting is put off until some time later bright behind this part.
When the utility model is used, which is powered to the light-emitting electrochemical element 1, the luminescent layer 14 and then production
A raw initial light 101 for white light, the initial light 101 is by the electric hole transport layer 13, the anode layer 12 are with substrate 11
The directive electric driven color-changing part 2.And the electric driven color-changing part 2 passes through for the initial light 101 of the light-emitting electrochemical element 1,
And the control unit 4 applies voltage to the electric driven color-changing part 2.When the electric driven color-changing part 2 is not powered on, the electrochromic layer
24 be transparent, (conductive layer 22 for connecting the electrochromic layer 24 is cathode), the electrode layer 23 when applying positive bias
In cation (Li+) enter the electrochromic layer 24, which is changed into blue in turn, therefore comes from the hair
The red light portion of the white light initial light 101 of optical electro-chemistry element 1 can decay after by the electric driven color-changing part 2, cause to shine
Frequency spectrum becomes partially blue white light, to obtain a modulation light 102 with higher opposite colour temperature (CCT).That is, passing through
The electric driven color-changing part 2 is biased, the color change of the electrochromic layer 24 is made, to which the initial light 101 can be changed
Colour temperature and obtain the modulation light 102, the colour temperature of the modulation light 102 is different from the colour temperature of the initial light 101.The modulation light 102 is certainly
In two base material 21 of the electric driven color-changing part 2,21 bottom surface of base material far from the light-emitting electrochemical element 1 is projected, therefore should
21 bottom surface of base material is equivalent to a light-emitting surface.
Further, when the bias applied to the electric driven color-changing part 2 becomes larger, the blue of the electrochromic layer 24
It can be gradually transformed into navy blue, and the red light portion in the initial light 101 will be followed and be filtered more, and modulation light 102 is made
Opposite colour temperature higher.Therefore, change the voltage value for being applied to the electric driven color-changing part 2, so that it may provided with instantaneous voltage regulation various
The white light of different opposite colour temperatures.
In addition, after applying fixed positive bias to the electric driven color-changing part 2, if changing bias polarity, it is changed to apply negative bias
When pressure, which can be transformed into the highly transparent state of script by blue, and then make the red light portion of initial light 101
Reduction is filtered.Therefore, it is the inverse time (can subsequently have experiment to be biased generated color changeable effect to the electric driven color-changing part 2
Illustrate), so as to change on demand in white light can by feux rouges number, to achieve the purpose that control colour temperature.
Refering to fig. 1,2, Fig. 2 penetrates spectrogram for the one of the present embodiment, is to apply fixed 1.5V to the electric driven color-changing part 2
Positive bias when penetrate spectrum and time variation diagram, and it is 4V that the light-emitting electrochemical element 1, which applies fixed-bias transistor circuit,.It can by Fig. 2
Find out, the curve for being labeled with " original " shows that the spectrum penetrance of the light-emitting electrochemical element 1 is about 80%, belongs to visible optical frequency
In spectral limit, the curve of mark " original " is the initial light 101, and the electric driven color-changing part 2 is not yet biased at this time.Then
Positive bias applied to the electric driven color-changing part 2, and as it can be seen that in the white light that light-emitting electrochemical element 1 is sent out after the time persistently lengthens,
Absorption of the red light absorption than blue light dramatically increases, and when the time reaching 210 seconds, the penetrance that wavelength is 490nm and 620nm is distinguished
For 62% and 52%, it is seen that the time for applying fixed positive bias is longer, and feux rouges penetrance is decreased obviously.
Refering to fig. 1, the test mode of 3, Fig. 3 is roughly the same with Fig. 2, and after being experiment in 210 seconds shown in Fig. 2,
Start to apply the electric driven color-changing part 2 back bias voltage for fixing 1.5V.When applying back bias voltage, WO3Electrochromic layer 24 is by indigo plant
Color gradually switchs to transparent, identical transparent element before making the electric driven color-changing part 2 finally become again and change colour.To electrochromism member
Part 2 applies back bias voltage and reaches 210 seconds or so, and the white-light spectrum of the light-emitting electrochemical element 1 also returns to initially not electroluminescent to this
Photochromic elements 2 apply state when any voltage, therefore curve at 210 seconds and " original " curve are close.By Fig. 2,3 it is found that
The electric driven color-changing part 2 in the case where applying positive and negative bias, measure penetrance as a result, it was confirmed that electric driven color-changing part 2 can be used as filter
Mating plate is used as regulating switch by changing applied bias polarity, and then controls the throughput number of feux rouges with modulation color
Temperature.
Refering to fig. 1,4, Fig. 4 is to change the positive bias (by 0V to 3V) applied to the electric driven color-changing part 2, in different positively biaseds
Spectrogram is penetrated when pressure.Increase with the positive bias of application, which gradually becomes deeper blue, applying
When bias becomes 3V from 0V, the penetrance for the light which sends out, wavelength 490nm is reduced to 23% from 77%, wave
Long 620nm is reduced to 8% from 79%, and as the positive bias of application increases, the difference that penetrates between blue light and feux rouges becomes
It is more significant.By experimental result it is found that when the positive bias for being applied to electric driven color-changing part 2 is higher, it will absorb more mostly from
Red light portion in white light frequency spectrum keeps the white light finally showed photochromic more partially blue, thus obtains higher opposite colour temperature.
In conclusion by the way that the electric driven color-changing part 2 is incorporated into 1 side of light-emitting electrochemical element, since this is electroluminescent
24 color of electrochromic layer of photochromic elements 2 can be adjusted, therefore be somebody's turn to do when the initial light 101 of the light-emitting electrochemical element 1 passes through
After electric driven color-changing part 2, part coloured light will decay and be formed the modulation light 102 of different-colour, and reaching can instantaneous voltage regulation color
The purpose of temperature.Via it is experimentally confirmed that the utility model colour temperature modulation range can be more than 10000K (from 2789K to 13601K),
Colour temperature can be adjusted on a large scale, and to coordinate various lighting demands and situation, application is very wide, can meet illumination application and intelligence
Illuminate most demand.And using activity, relatively low, work function is greater than or equal to the cathode layer 15 of the light-emitting electrochemical element 1
The metal material of 4eV can solve the problems, such as to be easy oxidation using high activity metal in the past and processing procedure is complicated, have splendid
Application.
As described above, only the embodiments of the present invention, but the utility model implementation cannot be limited with this
Range, i.e., it is all according to simple equivalent changes and modifications made by the utility model claims book and description, all still belong to
The scope of the utility model.
Claims (10)
1. a kind of electrochemical appliance of adjustable color temperature, including：Light-emitting electrochemical element can be powered and send out initial light, the hair
Optical electro-chemistry element include substrate with the first opposite face and the second face, positioned at first face of the substrate anode layer,
Luminescent layer on the anode layer, and on the luminescent layer and with cathode layer made of metal, it is characterised in that：It should
The work function of cathode layer is greater than or equal to 4eV, and the electrochemical appliance of the adjustable color temperature also includes electric driven color-changing part, and being located at should
Second face of substrate, and include two opposite conductive layers in interval, positioned at the electrode layer of the conductive interlayer, Yi Jiwei
In the electrochromic layer of one of described conductive layer and the ion conductor interlayer, which is used to shine for this
The initial light of electrochemical element passes through, and the color energy modulation of the electrochromic layer, is obtained with changing the colour temperature of the initial light
To modulation light.
2. the electrochemical appliance of adjustable color temperature as described in claim 1, it is characterised in that：The light-emitting electrochemical element is somebody's turn to do
Cathode layer is silver or gold.
3. the electrochemical appliance of adjustable color temperature as described in claim 1, it is characterised in that：The light-emitting electrochemical element also wraps
Include the electric hole transport layer positioned at the anode layer and the interlayer that shines.
4. the electrochemical appliance of adjustable color temperature as claimed in claim 3, it is characterised in that：The electric hole transport layer includes poly- two
Oxygen ethylthiophene and polystyrolsulfon acid.
5. the electrochemical appliance of adjustable color temperature as claimed in claim 4, it is characterised in that：The anode layer aoxidizes for indium tin
Object.
6. the electrochemical appliance of adjustable color temperature as described in claim 1, it is characterised in that：The luminescent layer includes transition metal
Misfit object.
7. the electrochemical appliance of adjustable color temperature as described in claim 1, it is characterised in that：The electric driven color-changing part further includes
Two two opposite sides for being located at the conductive layer, and the conductive layer, the electrode layer and the electrochromic layer are pressed from both sides
The base material being located therein.
8. the electrochemical appliance of adjustable color temperature as claimed in claim 7, it is characterised in that：Each base material is glass.
9. the electrochemical appliance of adjustable color temperature as described in claim 1, it is characterised in that：The electrochemistry of the adjustable color temperature
Device includes also for applying alive control unit to the electric driven color-changing part, which applies the electric driven color-changing part
The polarity of voltage or voltage value added can be changed, and the modulation light is obtained to change the colour temperature of the initial light.
10. the electrochemical appliance of adjustable color temperature as claimed in claim 9, it is characterised in that：The electrification of the adjustable color temperature
It includes for being powered to the light-emitting electrochemical element, so that the light-emitting electrochemical element sends out the power supply of the initial light to learn device also
Unit.
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| CN201820066857.7U CN207868229U (en) | 2018-01-16 | 2018-01-16 | The electrochemical appliance of adjustable color temperature |
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| CN201820066857.7U CN207868229U (en) | 2018-01-16 | 2018-01-16 | The electrochemical appliance of adjustable color temperature |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545995A (en) * | 2018-11-26 | 2019-03-29 | 京东方科技集团股份有限公司 | Illuminating module and luminaire |
| CN109887981A (en) * | 2019-03-20 | 2019-06-14 | 业成科技（成都）有限公司 | Organic LED display panel and its manufacturing method |
| CN110048003A (en) * | 2018-01-16 | 2019-07-23 | 荃合科技有限公司 | The electrochemical appliance of adjustable color temperature |
| CN110299474A (en) * | 2019-07-19 | 2019-10-01 | 江苏壹光科技有限公司 | A kind of electroluminescent device of adjustable color |
-
2018
- 2018-01-16 CN CN201820066857.7U patent/CN207868229U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048003A (en) * | 2018-01-16 | 2019-07-23 | 荃合科技有限公司 | The electrochemical appliance of adjustable color temperature |
| CN109545995A (en) * | 2018-11-26 | 2019-03-29 | 京东方科技集团股份有限公司 | Illuminating module and luminaire |
| CN109545995B (en) * | 2018-11-26 | 2021-04-27 | 京东方科技集团股份有限公司 | Light emitting module and light emitting equipment |
| CN109887981A (en) * | 2019-03-20 | 2019-06-14 | 业成科技（成都）有限公司 | Organic LED display panel and its manufacturing method |
| CN109887981B (en) * | 2019-03-20 | 2021-02-23 | 业成科技（成都）有限公司 | Organic light emitting diode display panel and manufacturing method thereof |
| CN110299474A (en) * | 2019-07-19 | 2019-10-01 | 江苏壹光科技有限公司 | A kind of electroluminescent device of adjustable color |
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